<div class="container"></div>
<style>
/* From Uiverse.io by uiverse-astronaut - Tags: gray, pattern, chess, checked, squares */
.container {
  width: 100%;
  height: 100%;
  background-color: white;
  background-image: linear-gradient(45deg, #ccc 25%, transparent 25%, transparent 75%, #ccc 75%, #ccc), 
                    linear-gradient(45deg, #ccc 25%, white 25%, white 75%, #ccc 75%, #ccc);
  background-size: 30px 30px;
  background-position: 0 0, 15px 15px;
}
</style>
